4 OCCLUSAL
DESIGN
4.1 SOFTWARE
The current version of CEREC 3D includes a variety of tools for mapping
the patient’s occlusion and articulation (static and functional)
and for the automated design of the occlusal surfaces.
- The DENTAL DATABASE contains various sets of data which can
be selected according to the specific situation.
- CORRELATION creates a precise and adjustable copy of the existing
situation.
- REPLICATION enables the dentist to create an optical impression
of any chosen occlusal surface (either contralateral in the
patient’s mouth or from a separate model). This optical
impression can then be placed manually on the preparation.
- ANTAGONIST maps the static occlusion of the antagonists.
- ARTICULATION maps the surface of a functionally generated
path (FGP).
Number of occlusal contacts of the casts before and after placement of the
different crowns (contacts of the restaurations excluded!).
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By combining DENTAL DATABASE, CORRELATION/REPLICATION with
the ANTAGONIST and ARTICULATION tools the dentist is in a position
to create functional occlusal surfaces on the computer monitor
– manually, semi-automatically or automatically. These occlusal
surfaces require only very little subsequent adjustment.
The manual reworking requirement can be reduced from approx.
400 μm (DENTAL DATABASE) to approx. 5 μm (CORRELATION plus
ANTAGONIST).
Provided that the equipment parameters are set properly, the
dentist can dispense entirely with manual corrections.
To determine the occlusal contact precision of CEREC crowns and
laboratory-made Empress crowns respectively, models of natural
teeth were measured prior to preparation and after placement
of the restorations. This comparison did not reveal any significant
differences between the CEREC and Empress crowns.
Source: Frankenberger
CONCLUSION Precise occlusal surfaces can be designed on the computer
monitor. These require practically no subsequent adjustment
in the patient’s mouth.